BillsDetailsActivity.java

package com.example.beaconhomes;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.sax.Element;
import android.sax.EndElementListener;
import android.sax.EndTextElementListener;
import android.sax.RootElement;
import android.util.Xml;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class BillsDetailsActivity extends Activity {

    private ArrayList<Itemisedbill> itemisedbill;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bills_details);

        Intent intent = getIntent();
        bills bill = (bills)intent.getSerializableExtra("bill");

        new DownloaditemisedbillListTask().execute("http://www.fcet.staffs.ac.uk/pfb1/IMWTAssignment/"+bill.getItemisedBill());

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_bills_details, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            Intent intent = new Intent(this, BillsActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    //The method to get the bills out of our XML file
        public ArrayList<Itemisedbill> ParseitemisedbillFromXML(String XMLURL)
        {
            //Our temporary variables - these must be final to guarantee we don't change them
            final ArrayList<Itemisedbill> values = new ArrayList<Itemisedbill>();
            final Itemisedbill currentbill = new Itemisedbill();

            //Convert our string into a URL
            URL feedUrl;
            try {
                feedUrl = new URL(XMLURL);
            } catch (MalformedURLException e) {
                 throw new RuntimeException(e);
            }

            //Get the RootElement of our XML file which is bill
            RootElement root = new RootElement("itemisedbill");
            Element bill = root.getChild("itemisedbill"); //Then list our element we want, so a single bill

            //Our End Element Listener event fires when we get the end of a complete bill tag
            bill.setEndElementListener(new EndElementListener(){
                @Override
                public void end() {
                    values.add(currentbill.copy());
                }
            });

            //All of the End Text Element Listeners get the body of the child tags of a bill
            bill.getChild("item").setEndTextElementListener(new EndTextElementListener(){
                @Override
                public void end(String body) {
                    currentbill.setperiodFrom(body);
                }
            });
            bill.getChild("periodFrom").setEndTextElementListener(new EndTextElementListener(){
                @Override
                public void end(String body) {
                    currentbill.setperiodFrom(body);
                }
            });
            bill.getChild("periodTo").setEndTextElementListener(new EndTextElementListener(){
                @Override
                public void end(String body) {
                    currentbill.setperiodTo(body);
                }
            });
            bill.getChild("cost").setEndTextElementListener(new EndTextElementListener(){
                @Override
                public void end(String body) {
                    currentbill.setcost(body);
                }
            });
            bill.getChild("amountUsed").setEndTextElementListener(new EndTextElementListener(){
                @Override
                public void end(String body) {
                    currentbill.setamountUsed(body);
                }
            });



            //Now we have set up all our event listeners, we can start to parse the document
            try {
                Xml.parse(feedUrl.openConnection().getInputStream(), Xml.Encoding.UTF_8, root.getContentHandler());
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

            //We can then return all our bills once we have parsed the XML
            return values;
        }

        //This is an inner class which runs Asynchronously (In the background)
        //It needs to be told the three types it accepts
        //String is the type that is passed to doInBackground
        //Void is the type that is used if we report any progress (We don't in this case so its Void!)
        //ArrayList<bill> is the data type that is returned from our background task and is passed to final function
        class DownloaditemisedbillListTask extends AsyncTask<String, Void, ArrayList<Itemisedbill>> {

            //This is the code that runs in the background - We can't update any UI in this function!
            //String... basically means we are passing in a list of strings but we don't specify how many!
            @Override
            protected ArrayList<Itemisedbill> doInBackground(String... arg0) {

                //This calls our Parse function above
                return ParseitemisedbillFromXML(arg0[0]);
            }

            //This executes back on the UI thread so we can actually update the UI here
            protected void onPostExecute(ArrayList<Itemisedbill> result) {
                //Save our result to our class level bill ArrayList
                itemisedbill = result;

                TextView tv = (TextView)findViewById(R.id.bill_periodFrom);
                tv.setText(itemisedbill.getperiodFrom());
                tv = (TextView)findViewById(R.id.bill_periodTo);
                tv.setText(itemisedbill.getperiodTo());
                tv = (TextView)findViewById(R.id.bill_cost);
                tv.setText(itemisedbill.getcost());
                tv = (TextView)findViewById(R.id.bill_amountUsed);
                tv.setText(itemisedbill.getamountUsed());
             }

        }

}